Automobile heater and muffler



Feb. 7, 1928.

W. A. HEALY v AUTOMOBILE HEATER AND MUFFLER Fild Feb. 1. 1926 INVENTOR. MAL/m1 4. #1544 V A TTORNE Y.

g when the motor is travelin 35 passes on Patented UNIT- oers TESL" PATEN OFFICE.

WILLIAM A. -HEALY, OI" DETROIT, MICHIGAN, ASSIGNOR TO STANIOARD TUBE & inn" UIACTUBING COMPANY, OF- DETROIT; MICHIGAN, A CORPORATION OF MICHIGAN.

AUTOMOBILE HEATER AND -MUFILEB. s

' Application filed February 7 This invention relates to combined mufflers and heatbrs for automobile bodies. It has been customary heretofore in-the practical art to heatautomobile bodies largely with 5 a by-pass of the exhaust in which a coil of v the by-pass is located under a register. These heaters, as is very well known, have been very unsatisfactory as most of them do not provide any appreciable heat except at a speed not permitted in city driving. his is especially true in the better class. of cars, with powerful motors that do not heat up except when I driven at a relatively high speed. One of the chief reasons for this difiiculty is that adequate circulating air is not provided to abstract the heat from the exhaust pipe.

It is the object of the present invention'to overcome this difliculty by employing a forced draft and bringing theiair intomtimate contact with the exhaust gases, andthen conducting and discharging the same into the body of the car. T 's method of heating is not broadly new. My invention resides in combining the heatin and mufiiing operations in one device an S0 ar-' ranging the conduits that a most eflicient air heating and mufilin operation is secured. v

I appreciate that it is also not broadly new to com his in one instrumentality a mufiier and heater, and I do not broadly claim this; but I do believe that it is new to provide a shell having a battery of tubes substantially in the exhaust line, and in which the exhaust the outside ofthe tubes where it can be mufiled with suitable baflies, and a forced draft of air asses through the interior of the tubes w ereb the" air is .completely surrounded by the ot exhaust gases 40 so as to get the maximum heating eifects for the air, while the exhaust gases are cooled by. transference of heat to the air so that the exhaust gases are contracted as regards their volume inthe absence of the heater, whlle the same time the gases-are muflied.

This arrangement completsllfi eliminates the necessityv of a separate m er and gets a higher heating efliciency than any heater" with hich Iam familiar. I

5 In the drawings:

. Figs. ,1 and 2 are sectional .views of differentforms. I

Figs. 3' and 4 aresectlons taken on the l a'nd of-Figg 2.

lines3-3ofFig; v, p a designates t e ma'niflfldgla the exhaust 1, 1928. Serial 1T0. 85,178.

pipe which leads into the tubular arm 0 on one side of the shell (1 of the combined heater and muflier. A second tubular arm e at the opposite end permits the attachment of the rear end 7 of the exhaust line.

This shell d' includes a pair of header plates 72'. which sup ort a batter of tubes 5 in boiler fashion. lhis type of eater is not broadly new, but in those heaters of the elongated type that are exhibited by the prior art, it has been customary to introduce the exhaust at the-ends of the heater and pass it through thetubes in the same way as done withthe products of combustion in the flue type of boiler. However, I propose tobuild my heater on the principle which has a en-' eral analo to water tube boilers. he fluid to w ich the heat is transferred is passed through the tubes. This has many of the advantages which are claimed for the water tube type of boiler, but in connection with a "heater used on internal combustion engines it has several unexpected advantages which are not suggested by the water tube boiler. One of t em is that it permits the use of the exterior chamber for exhaust ases. This is a spacious chamber, andence the problems-of back pressure, which have been serious ones in connection with heaters, are almost entirely eliminated.

This back pressure, as is well known, is a serious thingin automobile engines, and special designs of heaters-have been proposed to introduce the exhaust gases into the.

tubes to eliminate as far as possible this.

back pressure. However, one of the most important features of introducing the exha'ust gases on the outside" ofthe tubes is that it permits the bafllin gases and dividing the she 1. into longitudi nal sections or chambers which can beeach I properl proportioned-with respectto the other 0 or partitionsfcan be varied to varyythe-isizei" center tubes the usual. median is uired;

urthermore, .I find theuse of the beaten-y.

thatthe exposure of the exhaust gases to the cold air about the large drum "cool'sfthe of the exhaust design 'of eng1'ne.- i

ambers. so as to get the necessary@ muiflingactioni The placing of thesebaflles' consequently'a double eaipenseis inci ent to,

, tage that the e rectly gases and retards expansion thereby lessenin the noises incident to the expansion of exhaust gases. This coolmg, coupled with the expansion chambers completes the muf- Two dilferent forms of theconstructionare shown. In the-form shownin Fig. 1, four headers ,are employed; a battery of tubes is used not only to carry the airendwise through the shell,.but one header chamber a: is used to reverse the air which comes back through other of the tubes to the header chamber 3 from which it is discharged to the point of use. The mufiier construction is just the same. This form of construction has advantages in that one current of air is subjected to heating efiects through a longer ath of travel. The same eflect is procure in the construction shown in Fig. 2, but here the header chambers at the rear end of the mufller are. done awa withand the return of the air bein heate is effected by the elbows z. The ba es 1' take the place of the headers in su51porting the tubes. This construction has e advanta es of that shown in Fig. liland has the a ded advanout ofthe end of the shell or drum. What I claim is: 1'

1r A combined heater and muflier for automobiles or other vehicles driven by an internal combustion engine, which comprises a shell for location in the exhaust line and having ports in its walls for passage of the exhaust gases therethrough, this shell being provided with -a battery of tubes arranged. to twice conduct air to be heated thro'u h the shell and also with baffle plates, t e

being such. as to provide a plurality of expanding chambers which afl'ord' mufliing action without causing-backpressure, means for introducing air in; the tubes to heated by h haustgasses? the ga es, are

expanding insaid chambers, and means for conducting heated air to the place where it is t be utilized.-

2. A combined heater and mufller for automobiles or other vehicles driven by an internal combustion engine, which. comprises a shell for location in the exhaust line, abattery of tubes supported in the shell p arranged in two 'sets with the sets oftubes connected at one end, means for introducing a air to one set of tubes, means for conduct-- ing the air away from the other set-0f tubes,

aust can be discharged div means for conveying the heated air to the place where the heat is to be utilized, means for introducing the exhaust gases around the battery of tubes and discharging 1t from said shell, and a plurality of partlal part1- tions across said. shell through which said tubes pass for dividin said shell into a plurality of mufliing c ambers, the whole ell, and arran ed in connection with the shell to convey t e air longitudinally of the shell and then'return it back to the forward end of the shell, means for afiording a second header chamber at the forward end of the shell for collectin such returned air, means for conveying suc heated air to the oint of usage, means for introducing exaust gases into the interior of the shell and around said tubes, and means for discharging the exhaust gases from such shell.

4. A device for the purpose specified, comprising an elongated .shell provided at its orward end with two headers spaced from each other and'from the forward end of the shell forming two header chambers, a battery of tubes supported by said headers and contained within the shell for taking air enterin the first header chamber, transmitting it ongitudinally of such shell and returning it to the second header chamber, and means for conve ing the heated air from the second header chamber to the point of said tubes, and means for dischargingthe exhaust gases from such shell; I 35. Ina [device of the character described,

'the combination of an elon ated shell. roarrangement of the tubes and the plates g vided with a pair of transverse header p ates spaced from each other and from the forward end of the shell, forming two header chambers, a plurality of partial partitions or bafiles spaced along the shell, a battery of tubes supported in said shell spaced from each other and from the shell and arran ed to take air-'from the first header cham r,

' convey it lengthwise the shell and return it to the second header chamber at the forward end of the shell, means for introducing exhaust gases around thetubes andt'o-the interior of the shell, and means for discharging them 'from the opposite'end of the chamber in'which they are contained and about the tubes.

*6. A combined heater and mufiler. fora automobiles or other-vehicles driven byan isof internal combustion engine, which comprises a shell for l ocat1on in the exhaust line, two sets of tubes with one end of one set commun1 eating with one end of the other set supported .in the shell, means at one end for introducing air to the several tubes for twice conveying the air through the shell, means for conveying the heated air to theplace where the heat is to be utilized, meansfor introducing the exhaust gases around both 10 sets of tubes and discharging it from said shell, and means for divi ing the shell exterior of said tubes into a plurality of connecting chambers to efiect muffling.

In testimony whereof I have aflixed my 15 signature.

v WILLIAM A. HEAL?- 

